Chinese Physics C > 2002, Vol. 26 > Issue(5): 441-444

Shape Co-existence in¹⁵⁷Yb

Institute of Modern Physics,The Chinese Academy of Sciences,Lanzhou 730000,China2 China Institute of Atomic Energy,Beijing 102413,China

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Abstract：
The excited states of ¹⁵⁷Yb have been studied in the ¹⁴⁴Sm( ¹⁶O,3n) reaction at ¹⁶O energy of 90MeV using techniques of in beam γ-ray spectroscopy. The level scheme for ¹⁵⁷Yb was established based on the measured results of γ-γ coincidences,γ-ray anisotropies and DCO ratios. The level scheme is dominated by two parallel de-exciting sequences with different characteristics,which correspond to collective rotation and single particle excitations,respectively. This shape co-existence,as well as the structural evolution of the yrast νi _13/2band with increasing angular momentum,have been discussed briefly.

References

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ZHOU Xiao-Hong, ZHENG Yong, ZHANG Yu-Hu, GUO Ying-Xiang, LEI Xiang-Guo, LIU Zhong, HE Jian-Jun, LIU Min-Liang, LUO Wan-Ju, WEN Shu-Xian, ZHU Li-Hua and YANG Chun-Xiang. Shape Co-existence in ¹⁵⁷Yb[J]. Chinese Physics C, 2002, 26(5): 441-444.

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Received: 2001-12-12
Revised: 1900-01-01

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通讯作者:陈斌, bchen63@163.com

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沈阳化工大学材料科学与工程学院沈阳 110142

Shape Co-existence in¹⁵⁷Yb

Corresponding author:ZHOU Xiao-Hong,

Institute of Modern Physics,The Chinese Academy of Sciences,Lanzhou 730000,China2 China Institute of Atomic Energy,Beijing 102413,China

Received Date:2001-12-12

Accepted Date:1900-01-01

Available Online:2002-05-05

Abstract:The excited states of¹⁵⁷Yb have been studied in the¹⁴⁴Sm(¹⁶O,3n) reaction at¹⁶O energy of 90MeV using techniques of in beam γ-ray spectroscopy. The level scheme for¹⁵⁷Yb was established based on the measured results of γ-γ coincidences,γ-ray anisotropies and DCO ratios. The level scheme is dominated by two parallel de-exciting sequences with different characteristics,which correspond to collective rotation and single particle excitations,respectively. This shape co-existence,as well as the structural evolution of the yrast νi_13/2band with increasing angular momentum,have been discussed briefly.

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Shape Co-existence in¹⁵⁷Yb

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